I don't debate the priority of pedestrians in this situation, but I do disagree with you about their awareness. Pedestrians, wherever they're walking, should always be aware of other pedestrians, cyclists, cars, whatever, because they cannot guarantee the others will behave in a responsible manner. It's the same way that as a cyclist, I'll still make myself aware of other traffic crossing my path, even if I do have right of way.
As it happened, I hung back and waited for a safe place to pass slowly when the path widened sufficiently. I was in no hurry, but was just surprised at how oblivious someone can be for such a time.